body {
    font-family: Arial, sans-serif;
}

nav {
    background-color: #333;
    overflow: hidden;
}

nav a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

nav a:hover {
    background-color: #ddd;
    color: black;
}

.content-section {
    display: none;
    padding: 20px;
}